While Coke does have Sugar and caffeine, I use only about 4 ounces. I drink the oil straight then chase it with Coke. I do not drink Coke otherwise and I flush twice a month or so. I would really think twice about using Tab as it has saccharin in it and I am not sure what effect it would have. I know I have read not to use Diet Coke with the artificial sweetener aspartame. Just some thoughts.